Follow issue: Fixed subscription flow pick city

Follow main-jh pipeline broken https://jihulab.com/gitlab-cn/gitlab/-/jobs/7789777

Failures:
  1) Subscription flow for user picking just me for paid plan registers the user, processes subscription purchase and creates a group
     Failure/Error: super
     Capybara::ElementNotFound:
       Unable to find fieldset "City"
       Timeout (30s) reached while running a waiting Capybara finder.
       Consider using a non-waiting finder.
       See https://www.cloudbees.com/blog/faster-rails-tests
     # ./spec/support/capybara_slow_finder.rb:18:in `synchronize'
     # ./ee/spec/support/helpers/saas_registration_helpers.rb:312:in `fill_in_checkout_form'
     # ./ee/spec/features/registrations/saas/subscription_flow_just_me_paid_plan_spec.rb:23:in `block (2 levels) in <main>'
     # ./spec/spec_helper.rb:424:in `block (3 levels) in <top (required)>'
     # ./spec/support/sidekiq_middleware.rb:18:in `with_sidekiq_server_middleware'
     # ./spec/spec_helper.rb:415:in `block (2 levels) in <top (required)>'
     # ./spec/spec_helper.rb:411:in `block (3 levels) in <top (required)>'
     # ./lib/gitlab/application_context.rb:61:in `with_raw_context'
     # ./spec/spec_helper.rb:411:in `block (2 levels) in <top (required)>'
     # ./spec/spec_helper.rb:242:in `block (2 levels) in <top (required)>'
     # ./spec/support/system_exit_detected.rb:7:in `block (2 levels) in <main>'
     # ./spec/support/fast_quarantine.rb:23:in `block (2 levels) in <main>'
     # ./spec/support/database/prevent_cross_joins.rb:108:in `block (3 levels) in <main>'
     # ./spec/support/database/prevent_cross_joins.rb:62:in `with_cross_joins_prevented'
     # ./spec/support/database/prevent_cross_joins.rb:108:in `block (2 levels) in <main>'
     # ./jh/spec/spec_helper.rb:30:in `block (3 levels) in <main>'
     # ./jh/spec/spec_helper.rb:30:in `block (2 levels) in <main>'
     # ------------------
     # --- Caused by: ---
     # Capybara::ElementNotFound:
     #   Unable to find fieldset "City"
     #   ./spec/support/capybara_slow_finder.rb:18:in `synchronize'
Finished in 1 minute 30.58 seconds (files took 56.4 seconds to load)
1 example, 1 failure
Failed examples:
rspec ./ee/spec/features/registrations/saas/subscription_flow_just_me_paid_plan_spec.rb:7 # Subscription flow for user picking just me for paid plan registers the user, processes subscription purchase and creates a group
Randomized with seed 32337